Mu'adh b. Jabal said

God’s Messenger was detained one morning from observing the prayer with us till the sun had almost appeared over the horizon. He then came cut quickly, and when the iqama had been uttered he conducted the prayer in a shortened form; then when he had given the salutation he called out to us saying, “Keep to your rows as you were.” Then turning to us he said, “I shall tell you what detained me from you this morning. I got up during the night, performed ablution, and prayed what I could; but during my prayer I dozed and was overcome, and there and then I saw my Lord in the most beautiful form. He addressed me by name, and when I replied, ‘At Thy service, my Lord,’ He asked, ‘What do the angels near My presence dispute about?’ and I replied that I did not know. He asked it three times. Then I saw Him put the palm of His hand between my shoulder-blades, so that I experienced the coolness of His fingers between my nipples so everything became clear to me and I attained knowledge. He then addressed me by name, and when I replied, ‘At Thy service, my Lord,’ He asked, ‘What do the angels near My presence dispute about?’ I replied, ‘Expiation.’ He asked what they were, and I replied, ‘Walking on foot to the congregational prayers, sitting in the mosques after the prayers are over, and performing complete ablution in difficult circumstances. He asked what next they disputed about, and when I said it was about degrees, He asked what they were and I replied, ‘Providing food, speaking gently, and praying at night when people are asleep.’ He then told me to make a request, and I said, ‘O God, I ask Thee for power to do good things and abandon objectionable things, for love towards the poor, that Thou shouldest forgive me and show mercy to me, and that when Thou intendest to test any people Thou wilt take me to Thyself without being led astray. And I ask for Thy love, the love of those who love Thee, and a love of doing things which will bring me near to Thy love.’” Then God’s Messenger said, “It is true, so study it and learn it.” Ahmad and Tirmidhi transmitted it, and Tirmidhi said, “This is a hasan sahih tradition. I asked Muhammad b. Isma'il (Al-Bukhari) about this tradition, and he said it is a sahih tradition.”